Information exposure in Linux kernel - CVE-2019-15902

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Main Vulnerability Database Vulnerabilities #VU95693

Information exposure in Linux kernel - CVE-2019-15902

Published: September 4, 2019 / Updated: October 17, 2019


Vulnerability identifier: #VU95693
CSH Severity: Low
CVSS v4: 5.7 [CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N]
CVE-ID: CVE-2019-15902
CWE-ID: CWE-200
Exploitation vector: Local access
Exploit availability: No public exploit available

Vulnerability details

The vulnerability allows a local user to gain access to sensitive information.

A backporting error was discovered in the Linux stable/longterm kernel 4.4.x through 4.4.190, 4.9.x through 4.9.190, 4.14.x through 4.14.141, 4.19.x through 4.19.69, and 5.2.x through 5.2.11. Misuse of the upstream 'x86/ptrace: Fix possible spectre-v1 in ptrace_get_debugreg()' commit reintroduced the Spectre vulnerability that it aimed to eliminate. This occurred because the backport process depends on cherry picking specific commits, and because 2 (correctly ordered) code lines were swapped.


Affected software

Linux kernel
Ubuntu
linux (Ubuntu package)
linux-raspi2 (Ubuntu package)
linux-aws (Ubuntu package)
linux-kvm (Ubuntu package)
linux-snapdragon (Ubuntu package)
linux-hwe (Ubuntu package)
linux-gcp (Ubuntu package)
linux-azure (Ubuntu package)
linux-oracle (Ubuntu package)
linux-oem (Ubuntu package)
linux-gke-4.15 (Ubuntu package)
linux-aws-hwe (Ubuntu package)

How to mitigate CVE-2019-15902

Install update from vendor's repository.

linux (Ubuntu package) - addressed in versions 4.4.0-166.195, 4.15.0-66.75, 5.0.0-32.34
linux-raspi2 (Ubuntu package) - addressed in versions 4.4.0-1124.133, 4.15.0-1049.53
linux-aws (Ubuntu package) - addressed in versions 4.4.0-1096.107, 4.15.0-1052.54, 5.0.0-1019.21
linux-kvm (Ubuntu package) - addressed in versions 4.4.0-1060.67, 4.15.0-1048.48, 5.0.0-1020.21
linux-snapdragon (Ubuntu package) - addressed in versions 4.4.0-1128.136, 4.15.0-1066.73, 5.0.0-1024.25
linux-hwe (Ubuntu package) - update to 4.15.0-66.75~16.04.1
linux-gcp (Ubuntu package) - addressed in versions 4.15.0-1047.50, 5.0.0-1021.21
linux-azure (Ubuntu package) - addressed in versions 4.15.0-1061.66, 5.0.0-1023.24
linux-oracle (Ubuntu package) - addressed in versions 4.15.0-1027.30~16.04.1, 4.15.0-1027.30
linux-oem (Ubuntu package) - update to 4.15.0-1059.68
linux-gke-4.15 (Ubuntu package) - update to 4.15.0-1046.49
linux-aws-hwe (Ubuntu package) - update to 4.15.0-1052.54~16.04.1

External References

Related Security Bulletins